It's a well known psychological trap people people fall into where when we were at at $4K per BTC you could say to people "you should buy now because it's going 10X within 12 months" and 99% of people won't buy, but then they see it go to $40K and they say in their head "now I know someone has bought BTC for $40K I hope it will go to $4K again so I can buy it and then it will come back to $40K because it's already been here."
This means you're always at the back of the market, and you're going to be one of the people that get caught holding at bag at the peak of the bull run.
It's not going back to $10K and this isn't the peak of the bull run, it's only just beginning. It might get back to $20K, but it's headed up and $40K is going to be considered cheap in 6 months.